MVME3100 FPU Support on RTEMS 4.10.2
mrippa at gemini.edu
Wed Jun 6 21:24:50 UTC 2018
Thanks for the fast reply. Of all the mvme boards you listed,
the 3100 hits a nice price point and we're attempting to find
suitable replacement stock
for the 2700 which are no longer
Are the 6100 boards on beatnik bsp the only remaining option for RTEMS?
They cost nearly twice as much and have
thermal regulation issues.
On Wed, Jun 6, 2018 at 11:10 AM, Michael Davidsaver <
mdavidsaver at ospreydcs.com> wrote:
> Hi Matt,
> The MVME3100 is based on the MPC8540 processor. This chip doesn't have an
> Other boards do (eg. mvme270x, mvme6100, or mvme2500) and RTEMS supports
> I can certainly confirm that lack of an FPU really hurts performance, even
> something as (apparently) simple as integer to float.
> On 06/06/2018 02:03 PM, Matt Rippa wrote:
> > It appears we've compiled our mvme3100 bsp without FPU support.
> > We're on the mvme3100 running EPICS 22.214.171.124 and RTEMS 4.10.2.
> > We're attempting to commission our astrometric kernel control system
> > and we've run into trouble meeting some of our thread deadlines. What
> > we've found is a transform routine that takes our mvme2700 ~200 us,
> > takes the mvme3100 ~8 ms. So not a surprise to see this with only
> > ...
> > 2018-05-31-tcs.log:May 31 11:41:15 E) PORT: tcs_vme, MSG: Welcome to
> rtems-4.10.2(PowerPC/Generic (*no FPU*)/mvme3100)
> > Is FPU support possible with RTEMS 4.10.2? If so, what would we need to
> > It looks like there's a multilib on 4.11.2 https://docs.rtems.org/
> see #13* )
> > Here's our bsp specs:
> > beatnik:
> > -specs bsp_specs -qrtems -fasm -c -mcpu=7400 -D__ppc_generic -DUNIX -O2
> -g -g -Wall
> > (mvme2700) mvme-2307:
> > -specs bsp_specs -qrtems -fasm -c -mcpu=604 -mmultiple -mstring
> -mstrict-align -meabi -DUNIX -O2 -g -g -Wall
> > mvme-3100
> > -specs bsp_specs -qrtems -fasm -c -mcpu=powerpc *-msoft-float*
> -D__ppc_generic -DUNIX -O2 -g -g -Wall
> > Thank you!
> > -Matt
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